. >>> the words four more years coupled with a photo of barack and michelle obama embraced in a hug is the most retweeted post ever. the u.s. president tweeted just. and it's been retweeted half a million times. >> do you think he actually pushed the tweet button? >> twitter doesn't let you to that anymore which i found out when i tried to -- >> what do you mean? >> it only counts -- >> he it actually didn't -- >> oh, tweet it in the first place. no, they probably have a team of people. >> that's what i mean. >> so to say that he tweeted is not factually correct, is it. >> thank you for catching that. norm johnson is here to talk about just how as we were discussing, how candidates use social media. and to you you think the way in which obama used it helped his re-election? >> ross, first of all, i think it was his kids that tweeted it. that's the trick that i use. but i think it certainly helped. if you look at the power of word of mouth particularly for those that are undecided, that haven't decided which way they want to vote, social media is an incredibly powerful tool. if you look